Picolisp a Railroad Simulation
A railroad simulation in PicoLisp uses Discrete Event Simulation (DES) to model trains as bots moving between stations, changing tracks, and shunting. Users control the simulation through logic and network layout files.
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A railroad simulation using Discrete Event Simulation (DES) in PicoLisp is introduced, allowing users to create a model railroad experience in ASCII format. Trains are represented as bots with locomotives and wagons, moving between stations, changing tracks, and shunting. The simulation is controlled by two files: bahn.l for logic and plan.l for network layout and parameters. DES offers advantages over continuous simulation by dynamically determining train movements based on individual schedules. The simulation includes functions for train states (waiting, moving, shunting) and track elements, enabling complex layouts with loops and switches. The ASCII drawing and user interaction are managed by the display function, allowing users to navigate the simulation and toggle switches manually. By following examples and tweaking the code, users can create their own railway models using DES in PicoLisp, potentially enhancing the visual representation beyond ASCII.
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8 commentsFun fact: there is at least one track network (the Munich U-Bahn) that avoids loops and interconnecting lines "the wrong way around", so trains always face the same way (https://www-u--bahn--muenchen-de.translate.goog/fahrzeuge/?_...). Because of this, two-carriage trainsets have a "north carriage" and "south carriage", and the newer six-carriage trainsets have north and south end cars plus four middle cars. Of course, not all tracks run north-south, but the name is taken from the way the carriages point in the first (and at the moment still the only) maintenance yard in Fröttmaning.
Connect it to OSRD!
Open-Source Railway Designer (posted a few days ago) https://news.ycombinator.com/item?id=40733705
https://en.wikipedia.org/wiki/Lego_Loco
You could build little villages with train layouts. The big thing for them, is you could put tunnels that would connect to another user. It let you send trains and the mail card had "post cards" you could send messages.
I miss it.
- use ds and discrete event simulation instead of the usual dt (and continuous …)? Why? Seems all game engine offer dt …
- shall the track be one way and if two way traffic has to use 2 tracks? Otherwise if >1 train or train-group … crash ? And if there are junction … route and timing would be issues otherwise crash ?
- picolisp vs fennel ?
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